You might want to think twice before blogging a product or service that you were either given for free or paid for writing about. Even if you good intentions -- which most bloggers do -- you could be breaking the law. So, what's the scoop on product endorsements in blogs? Just five or so years ago, this wasn't even a topic for discussion. Bloggers wrote about products without disclosing any relationship they had with the manufacturer. Since then, however, the Federal Trade Commission (FTC) has revised its guidelines to prohibit this practice. Bloggers are still free to write about products ...